Romney kills two birds with one stone with ads like this, drawing the contrast with Gingrich and reassuring voters who might have issues with his religion that his values are right in line with theirs (and very much not polygamous). Here’s the thing, though: For all his claims of “constancy,” the same NYT poll linked above shows he’s the only candidate in the field whom most Iowa Republicans don’t quite trust. When asked whether Gingrich says what he believes most of the time or says what he thinks people want to hear, respondents split 63/30; when asked that about Romney, they split … 40/53. He’s the one and only candidate in the field whose numbers are underwater; even Huntsman is +10 on a 33/23 split. Not so good for the candidate of “constancy.”